Note: if your OPK provides high or peak fertility results instead of positive or negative results, log a
positive OPK test result when you get a peak fertility reading.
How does logging a positive or negative test result affect my predicted period and fertile
window?
When you log a positive OPK test result, your fertile window and next predicted period adjust based on
your new ovulation day, which is the day after you log the positive test result.
Your future cycle predictions adjust based on the positive OPK test results you log, but past cycles don't
change. If you delete a positive OPK test result in the current cycle, your predicted period and
estimated fertile window predictions adjust.
If you log a negative OPK test result, your predicted period and estimated fertile window in the Fitbit
app remain the same.
Why don't I see an estimated fertile window after logging a positive OPK test result?
In order to see your estimated fertile window in the Fitbit app after logging a positive OPK test result,
note the following:
If you log more than 2 positive OPK test results in a cycle, the Fitbit app can’t provide an
estimated fertile window. Note that if you log 2 positive OPK test results in a cycle, you must log
them on consecutive days.
If you log a positive OPK test result that causes your fertile window to shift to a different cycle,
the Fitbit app can’t provide an estimated fertile window.
For more information about ovulation predictor kits, see our blog post: Using Ovulation Predictor Kits to
Help You Get Pregnant? Here's What You Need to Know.
Can I edit a fertile window in the Fitbit app?
Your estimated fertile window automatically adjusts based on the menstrual cycle data you enter.
You can’t edit fertile windows.
To turn off fertility predictions, see How do I edit my female health settings?
How do I read the female health tracking
calendar in the Fitbit app?
Tap the Today tab , then tap the female health tile to see the calendar with your cycle
information. The different colors on the calendar indicate various stages of your cycle. Tap a
date to see the female health details you logged for that day and other information.
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